package tijava.concurrency;

//: concurrency/Interrupting2.java
// Interrupting a task blocked with a ReentrantLock.
import java.util.concurrent.*;
import java.util.concurrent.locks.*;
import static net.mindview.util.Print.*;

class BlockedMutex {
	private Lock lock = new ReentrantLock();

	public BlockedMutex() {
		// Acquire it right away, to demonstrate interruption
		// of a task blocked on a ReentrantLock:
		lock.lock();
	}

	public void f() {
		try {
			print("f() begin...");
			// This will never be available to a second task
			lock.lockInterruptibly(); // Special call
			print("lock acquired in f()");
		} catch (InterruptedException e) {
			print("Interrupted from lock acquisition in f()");
		}
	}
}

class Blocked2 implements Runnable {
	BlockedMutex blocked = new BlockedMutex();

	public void run() {
		print("Waiting for f() in BlockedMutex");
		blocked.f();
		print("Broken out of blocked call");
	}
}

public class Interrupting2 {
	public static void main(String[] args) throws Exception {
		Thread t = new Thread(new Blocked2(),"be blocked thread");
		t.start();
		TimeUnit.SECONDS.sleep(1);
		int i=0;
		while(true){
			i++;
			if(i==30){
				System.out.println("Issuing t.interrupt()");
				t.interrupt();
			}
			TimeUnit.SECONDS.sleep(2);
		}
	}
}

